399444517 has 8 divisors (see below), whose sum is σ = 420111360. Its totient is φ = 379264080.

The previous prime is 399444497. The next prime is 399444547. The reversal of 399444517 is 715444993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399444517 - 2¹¹ = 399442469 is a prime.

It is a super-2 number, since 2×399444517² = 319111844322726578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399444547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119917 + ... + 123202.

It is an arithmetic number, because the mean of its divisors is an integer number (52513920).

Almost surely, 2^399444517 is an apocalyptic number.

It is an amenable number.

399444517 is a deficient number, since it is larger than the sum of its proper divisors (20666843).

399444517 is a wasteful number, since it uses less digits than its factorization.

399444517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243203.

The product of its digits is 544320, while the sum is 46.

The square root of 399444517 is about 19986.1081003781. The cubic root of 399444517 is about 736.4650722461.

The spelling of 399444517 in words is "three hundred ninety-nine million, four hundred forty-four thousand, five hundred seventeen".